壁面轴向导热对微细管内对流换热的影响  

EFFECTS OF AXIAL HEAT CONDUCTION IN THE WALL ON CONVECTIVE HEAT TRANSFER IN MICROTUBES

作　　者：王玮[1] 葛峰[1] 李志信[1] 过增元[1] 

机构地区：[1]清华大学工程力学系,传热强化与过程节能教育部重点实验室,北京100084

出　　处：《工程热物理学报》2003年第5期846-848,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.59995550-2)

摘　　要：本文通过数值解析的方法研究了考虑壁面轴向导热时微细管内的对流换热。结果表明,当管外为对流换热边界条件时,管内充分发展对流换热的Nu依然在3.66～4.36之间。但若忽略壁面轴向导热,采用一维热阻模型整理微细管内对流换热的实验数据将会导致错误的结论。Effects of axial heat conduction in the wall on convective heat transfer in microtube have been studied analytically. It is shown that the Nusselt numbers inside microtube are still in the range of 3.66 and 4.36 with convective heat transfer boundary condition outside the tube. However, one-dimensional thermal resistance model which is usually used for the experimental data reduction will underestimate the Nusselt numbers, and leads to misunderstanding on convective heat transfer in microtube.

关 键 词：微细管 固壁轴向导热 对流换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]